45 gallons of 113 :)

[The_Jerbel]

Re: 45 gallons of 113

if you use higher octane then the ignition timing is tuned for then you will make less power because higher octane fuel burns slower and that changes the flash point.

That's a common misconception. Higher octane fuel does not burn slower. It just takes greater energy (via compression) to overcome the combustion threshold.

[aliencurv]

Re: 45 gallons of 113

That's a common misconception. Higher octane fuel does not burn slower. It just takes greater energy (via compression) to overcome the combustion threshold.

where did u hear that?

[stefan]

Re: 45 gallons of 113

That's a common misconception. Higher octane fuel does not burn slower. It just takes greater energy (via compression) to overcome the combustion threshold.

thats how i understand it. you wouldn't want fuel to burn slow. You want a fast burn at the right time. Low octane at high compression will pre-detonate. High octane will prevent this so that you can control detonation with a spark rather than high compression triggering the burn before the piston is in the right position.

[The_Jerbel]

Re: 45 gallons of 113

where did u hear that?

I learned it from more credible sources (textbooks in university), but here is a quick link that explains it quite well:

"Higher octane ratings correlate to higher activation energies. Activation energy is the amount of energy necessary to start a chemical reaction. Since higher octane fuels have higher activation energies, it is less likely that a given compression will cause detonation."

Octane rating

[aliencurv]

Re: 45 gallons of 113

I learned it from more credible sources (textbooks in university), but here is a quick link that explains it quite well:

"Higher octane ratings correlate to higher activation energies. Activation energy is the amount of energy necessary to start a chemical reaction. Since higher octane fuels have higher activation energies, it is less likely that a given compression will cause detonation."

Octane rating

i hope everyone on here already knows what octane is and why it's important for ignition timing and static compression in respect to it's flashpoint. i don't think you need to paint that half of the picture as the link you provided is regarding octane specifically and not the burn rate.

there are varying additives used by different companies that have unique properties. as you know, all addivites affect the burn rate as well as the octane rating.

113 does contain a lot of lead, as you mentioned earlier. does lead affect the burn rate?

[The_Jerbel]

Re: 45 gallons of 113

I have no idea to what degree lead affects the burn rate specifically, but I highly doubt it's substantial or else it wouldn't be used in high engine speed applications where a very fast burning fuel is required.

I was merely commenting on your previous statement about high octane fuels burning slower, which just isn't the case. Higher octane doesn't necessarily mean slower burning, it means more resistance to burning.

[aliencurv]

Re: 45 gallons of 113

Higher octane doesn't necessarily mean slower burning...

so it also does burn slower? i'm getting confused lol

..it means more resistance to burning.

more resistance to burning or more resistance to detonation?

[The_Jerbel]

Re: 45 gallons of 113

so it also does burn slower? i'm getting confused lol

No, it generally doesn't burn slower. BUT, I'm not going to make a blanket statement and say that ALL high octane fuel burns at the same rate as lower octane fuel. That's why I phrased it the way I did. I'm sure there are some high octane fuels with a slower burn rate...

more resistance to burning or more resistance to detonation?

Ok, smarta$$, I'm not sure what you're trying to prove here

Essentially detonation and burning are the same thing, just caused by different types of energy. If you want to get really technical, it has a higher resistance to "detonation", but most people don't nitpick wording that much

[The_Jerbel]

Re: 45 gallons of 113

if you use higher octane then the ignition timing is tuned for then you will make less power because higher octane fuel burns slower and that changes the flash point.

BTW, where'd you hear this?

Any evidence to back it up?